Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c6acf7f275fdef11629dc4193b195148cee41c766e91654b441c9a8c6d8ea9e' 
  AND token = 'Ir8hXeWBRdlC5+Gy5+NN6RAUunVcqXYctnmKiywW5KE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}